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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3982739e06090572d4de8ec1e26fe9f71ee85c203f6f107b99060465a471802' 
  AND token = 'HZWTNtm3t0RzPdwqEMt74CrKKPFCR/Vfyzf2PyqVmuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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