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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '124abb71a7e18cac196f7e95932bd9b20e7f9b6d82bafe08a8956d6012c3e465' 
  AND token = 'uLAeo0gDkawg2GWiTHmpOeoVSQzuv4ssZIHpSZneJ3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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