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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2746be5aa4300ea49354a21d9dec26989f53c843ed360294692aae5b5ce5b7d' 
  AND token = 'HlaUMHXXCrj1g4RofIJ7hrMBAr3nWH8/0o3w99N0+Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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