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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83170ac76d72eff080646e587670782639c1fb222c0ffdd5a0522b65226cf97e' 
  AND token = 'YEb/cmYPKLXFICaFIryZA0/SVBK0sEgwx2/L0nbj5vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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