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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '401152bf23365971515f57ac7a119f9e70594be1d0603e0d1ab11f04db5c8c1d' 
  AND token = '181T4LGtCl7c4tJ1iOtc4wlDd9R5oyXgcwiVJvrlp7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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