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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cf3f4af0bb1a1d60bc71f9ee9f37f1dc0b4fb3d73f5146a24b15f542d731b5f' 
  AND token = 'JCOX/8UnXNs4s+x9/9Ew67CaDLngNYe88Iq0vXHTEs0=' 
  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"
    }
  }
}