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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baff60b9db927235f434181c4e4445466caa92af4e7f84b5918fc7a8b4fcc242' 
  AND token = 'nd1He6iAaSh+33Q/8CeG+fo7IIgkt4jucClnCTBe3XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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