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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f85ede47324f5311e20d29e12e3511225cc620966617130ccc5d6a278bc2f994' 
  AND token = '3/XJFfSgPl4Vz09g9E7RnaydvJB09/L1TVuq2/0B6Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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