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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8637f34768e1a9c2a7ca747374827273924ae8ca75704a60fe7a3de7ccf003be' 
  AND token = '5HnUd0zkGGx3+Ix6Wufw4sgHPjeGWLR4axcHx4gf5kE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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