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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c78bbf03d8f846cf4553164619e27a75d3bba28ad194a3b1ed44aec52d1c2c3' 
  AND token = 'Y/4waAnS88Wc+WwJVXT7Qn6A6msKQLTNbRE86J/xlP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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