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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5a8134e38522d5ee31721cd548880204dcf4c171fdb2a442c1da872d7dc575c' 
  AND token = 'KMNXwPUFow4/yeyOpw2wG7AdeeV5aknAZQQadZCyWfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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