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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51155af3f117ce8bddce08aaa3c3bcfbc59c6a9e86b9a78f20bdea60acd2f8a3' 
  AND token = 'sOTE4BOoB0QMtlop1J0RtNegiU1s1XhTH16XMZ4uZ5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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