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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95510eebb142ce1d95a18546a91aa66ee7e1d4af14d8508061a24057124daca0' 
  AND token = 'DaIqq6UfW54c+xJRIOVkG1PrvyUWdWVxPAT9DmcfjyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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