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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1558275b3aa92857f77e184d0b8d44fd37786264d8dcdf050a93cd2d00f55f44' 
  AND token = 'UZJ5ElHBHg86Wge+oFMhBzVb4ndyb0d7cjBp9R7PO2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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