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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df0956c32b91c05a2b9c3bc68c9bb9b86fb38a0554e2c69d612e298fbf01dc14' 
  AND token = 'LmEiy4Uds/LAw4XCQ/kaij+GhHGMmyhJwJGZh55jTRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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