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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '565d62d6f85a2abb9397be64261b60b9f3c64f9a1aac03637aa29b44fc5eab8b' 
  AND token = 'U0YLjRQJwP2tRpjqi5iqvCPS/kcr61qSD2i/lwOfbwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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