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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc45490d9fd2d8d1af0027d988bad700468d3732f092e862b9a7ffe0d9a2a227' 
  AND token = 'b5g825NaPQOEESmhpcAJWBl8ywGk767rR821G4XfC/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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