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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88746bf4933484e27fde92bfd6a47ce8a63bb2503eba46351203a362eb94c94a' 
  AND token = 'Mmsp8VWn7iJ9tKK0HMrNSWFZJBeiFFbTYZSGNWQI9z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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