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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2997e5f099941e02f78c4fb2f9e374a24577ae1f510e6e0879cf4ad0d339244d' 
  AND token = 'wInN1u5F/5oKy5TAX8L+cbBC/hMcFmv4qPKw8COrWkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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