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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbf855c9d79083c6dd9b49e1ef9c642a5f60b226084882cd226382498d21623c' 
  AND token = '5eZq9pxy0jl+y2eRE82WfAr195jPpjopE9rETQFTwaI=' 
  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"
    }
  }
}