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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c50675a68ea5834c4281f6a4093084b897924121f381f894a2dd49f34a846b3a' 
  AND token = 'mtwg2dTD8cf2gPOvE/AKBwGGlnY6ntfioeR0wX5lDi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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