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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b0485f7ed22b7f16d0d1013ddbf00d6f70559f3502c34c34ab83dfd1852e504' 
  AND token = 'SzwFLGCmTSTDTBv6qzZSnlCNceF8sl4LWy6Pf6jOlJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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