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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b80f5dd2eff1cf42afd0e14f1f3f52b5acc69e1ceabeb9cb7e8467e0f19b509' 
  AND token = 'u8CmnmiOSuLt44BpotW9/N29wn2/+/aGue+yHbtRUPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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