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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c986708af0907c28f1a5875ad71f29d8e9cb8f9ecae6095234c6060c05d721a2' 
  AND token = 'vWV+YcR0H+D3ZvpgfFTpmP6s43Dx2f3BwuBsDIa6KwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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