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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20252ba7c04983b31a30c9e8d950eafbf26322fc67b616707cfb03c9ddd2556b' 
  AND token = 'KOB41qqdFmFVpevbDD2TinAmzmJKZ9XydhdPAX9G4Xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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