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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c22f250c4137fba154c40bb9cc72f0bdce22fb7596d38cabc58c0826d5c8760' 
  AND token = 'uaCkVZ/nt3/uj45ZaatrdDOGnp1LAaU/xpZn5qbVrkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}