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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5547b0800d6490c7d56ce56b21532089b9408f4b97bfd5df4e83f4b2877dc9e' 
  AND token = 'nQTD3c2c620uELr4+LKpeuujvV+gbd/TpTSR3YGZ6Xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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