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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '082a4d02a712a96e67c756b805af9abc69fec1f89366b76cbf4e79b66f0ea961' 
  AND token = 'LO0GN0jAr5IfFnhSp4Cs0laUfr8k938QqsRRibGz8EQ=' 
  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"
    }
  }
}