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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a23790dd8a9a44a0438e489ef364ab9349d163ce307ba0177808a58962458ead' 
  AND token = 'o2vvpeWcBaJ8iE8QBLJHfJR4L6NHg9rsoYZ9aX0LhDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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