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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e179659dec3105b16a74139cd655e9ac77ca629d82b8b344af78838db20e6aa' 
  AND token = 'c9idfNqzDblj0WSTE96Fpo2X3uIxUArPq19nM3W84fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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