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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd42d78405d01d5709cbb82219d8f8be028e3cef1a3b152f0bc2a744e1b9e6893' 
  AND token = 'kvsM3VxEfTDujzlf41NOWqy015Q2w8JlfpD2wb4JOwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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