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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caa0466a1ef35d19d830f66dd9068b81e5a347110d69cbb2cde0a177bb9816e7' 
  AND token = '1yxK7aohY+IzuyMSC+A4VG9FwKO2XfJcmIMigCJK9Ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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