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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4887eb458703c62141579d169671f7f9be4d82e0cadeab04f9f4a40ce857a8d5' 
  AND token = 'LcgwkL1QSkTbyqbMZPCtK/VfrMaTQ+m088CSU265CdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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