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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '879e8fb287815a6db9f470f9ff7444c016ab0e18f609ab167936ca90847122f6' 
  AND token = 'rD5lm6JjsTT9mHyeVQcv1BslNa2UP1T3FL7M5lmlxso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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