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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0de04478fd166a2f73809dcb4c323a34c5d64fc3a3617749d1ef25bfca5e510' 
  AND token = 'MowM3+Cil9/5jiQRbNK7MFYxEU+F696g6Pc+KzLKRUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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