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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab4c7935bdfdd58dea368cf2c96b6f559b5fb2aff5df4e740b797218dd9d9d23' 
  AND token = '0C9lhpMyH60DFDf4WNTzq4SGvtvJg21Whf3CGQ9/WGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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