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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f24a6cb23d1f7232dc9cc558a4cf262d45f7d0b78cdee2e7fac511dd0ba9656' 
  AND token = 'xlKiN2RG/JRQLAh1KPXV9NI3uA/ld0Qj1AuTbgUYykQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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