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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18d6b249ed11ec52685dba80b7060d50166f85c52ac260bd1adcca4abc1c6846' 
  AND token = 'M1CQ6h5tO0IvB+e4Xd/qmyvWLgB1ddIyZgm4g4RUtrE=' 
  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"
    }
  }
}