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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '437f05a74847de0037a24682bd4f33fa4f6b7e8dbb94e5f32ce122d6e6b631ac' 
  AND token = '4VuEpVsMTV9lIhhW65kpwgk8TankoY6yEHViP6aOlHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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