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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3087ee7e84992489f24d5a6eb9714a9f205589b4bcaeca4253647d5455cc06ae' 
  AND token = 'ZjZGtgmt4wvS6ohKlyf13YfckdexwJrJVEx/NMXIawo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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