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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b573fdcd63679f92e8bd0cd4360bb749f26a11dc23233c44a9733fe0c761f6' 
  AND token = 'S3ieejXyPPz43ujKUKqhtVgv6fDtBjDdKjVeij5vDps=' 
  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"
    }
  }
}