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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73f4eb40dac114477ca7ef78b0690847c225e9044c9844e8fdbbd4c85c76f594' 
  AND token = 'B05Bvyewv3cyWwPi4snlCuZFLcc/oKikuc6uhbfNzxs=' 
  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"
    }
  }
}