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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed1769f53d6b34cb395d3ca9fab3ba653e8928212cdf7a14b4879d2be3134511' 
  AND token = 'gcPc7pp1oXSedLrHRaMuuLB4IXQwC33oqBpxaejp/BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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