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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f575e4e13edf690dbcf43006dc1da2b025efd541f933d1f41b8fb75a6672b36' 
  AND token = 'fO+2PrnOueMlMTbneIJe17v2rBxNKRIlymWEWtNwb/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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