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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a90a1980ed652d195ab749b50aec9850fa17f2da374874a5b8cd83fc0f12cd8' 
  AND token = 'kZ9SF9e4pOnPFvkAVN+U7mshM6hozan2Z25La0lmSMQ=' 
  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"
    }
  }
}