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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b727307e07adbc0295c7bc504096407cf65bb7d93ea47b36f9bf9332c3faf1f' 
  AND token = 'fj9CKd7DWzTPewX/o4mDPJe6IkrOweBCR9kSEAKQiZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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