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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e580ca0d8474241cd66454035ab69f00eb4e416ed90fe75dbd6528a29eebec85' 
  AND token = '5w6oBA9qb/qTh9JtnsT+MA5/rl7bvvepi2eIY1ahIzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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