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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33c30f009c0b226671c7d3c2b66284100974976e25fa5ad29157db43b149e69a' 
  AND token = 'CmD7hL2OzOSZrPa6CmbTnsH5RVF2UtwWsQZz4PcJu+o=' 
  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"
    }
  }
}