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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c2e973b748063ec40b8028ccac7e4ac3fb2e9e78582e4b1f2fbb62b4f817548' 
  AND token = '+b7YgwngR+uuS9mNJQOlPBsOesHbfxBpOlRwh9pIRFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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