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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '887fc4d95397735b2164d629dca75542f00a5a255625cdf3efd8f90da660cbd1' 
  AND token = 'HapASe+W/t1lL5lXHLbov3TuMUMSVIt7AAINE9S7d/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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