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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '055cc711577d4b34d0bb6aefc4747025ddd1acf3a954a0d0d59295b423020936' 
  AND token = '2M0DplcKIJ3nz72eCoaHkPDCmieO8u+FcMbHsHTXBtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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