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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c389ea96a90f5b8c64dee90fea0566baed1ebc82e12c50cb3e6a3f8e96eb82b' 
  AND token = 'oQBJGDAMVfaHZ5Ta7g4EktQvZVW9Sc1SM8PS30fgA3I=' 
  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"
    }
  }
}