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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd316fd922d118c8e2f904b65ebd9fcad1040a6b01c63c9fc88928d05e74479c' 
  AND token = 'kcZENEOnr5zWKcP/rNxsiKH47v/fjleAFvljsKuNCrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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