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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '434aef97f1c8e9a1cf98716ac465903193ac9cdfcd961a8cf9ef96a63acc4e0c' 
  AND token = 'pGP4/64eK45WAoSUzATWU1JwXB2qw2GyS2yl7GKP9Qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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