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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cfaa096a8a63994261088436df54a509d25c1c397c0bbeb0a36e4d524b28b2b' 
  AND token = '8K8rlSFufe0xPzEjWZEbQKZXJ9mFWL0VSjEvqlj6CEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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