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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ed559ef6c3f218d7245fcb4dd3151d3ba28e368dd472c5f07b962d7bf106766' 
  AND token = 'dZlhSn4vimTQwFDL9Mf3IAqKMUik94rr9i24VPFaUpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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