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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '410a716caab43d7b917cd57d77559ccefe784c0b0a9b00738966e4cde8400f19' 
  AND token = 'da41sxBKN6pVPzgKvsrKKmszACBruQIQGcJr20x+x7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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