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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fb63309f97f418bae92fc6406b16f6619910bd27a9d46dcae301bf2407b04a7' 
  AND token = '1JjO6UNTzv8+fe+d4z3GQ/Ftnlwx2bS/I6o8dNVEzE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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