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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af571e0790afb2b7302204954b2a2fa574c6326b0968ac9b2da5bd39990a97a0' 
  AND token = 'qNUp6uVBi7W28KzkdR1A0iJi7vTKqG4EtrYHdtmw8Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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