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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a188346683f82cfee1552a55ed0ea71cbbe4cce9a62f1d54e1ca989a707a074' 
  AND token = 'A5occpmtmzavYRXQSfnZ5P5dV38nSm8Nq3HzhK9Htzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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