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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21a047120060aaa710db8e20abcb4033ddf43c98fb9b3c24951fedcbe8524842' 
  AND token = '0De0PemifUbbswVLO7Z1iW3Lz5m06dI1Uzo8kzOWgpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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