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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b81967041e17269483aa522704c9d82208cd27c0df4b48204adf604ba2db2a11' 
  AND token = 'X7sRgZiD1QLd9SXHwPHIfmRfpzRZkqYSXvfAIeTtkE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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